<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>何为数据代理</title>
</head>

<body>
    <!-- 数据代理：通过一个对象代理对另一个对象中属性的操作(读/写) -->
    <script>
        let obj = {
            x: 100
        }
        let obj2 = {
            y: 200
        }

        Object.defineProperty(obj2, 'x', {
            get() {
                return obj.x
            },
            set(value) {
                obj.x = value
            }
        })
    </script>

</body>

</html>